A method may include measuring an electrical parameter of an electromagnetic load having a moving mass during the absence of a driving signal actively driving the electromagnetic load, measuring a mechanical parameter of mechanical motion of a host device comprising the electromagnetic load, correlating a relationship between the mechanical parameter and the electrical parameter, and calibrating the electromagnetic load across a plurality of mechanical motion conditions based on the relationship.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The method of claim 1, wherein correlating the relationship comprises calculating based on the back-electromotive and the velocity, for each of a plurality of velocities of the host device, a respective magnetic force factor at such velocity.
3. The method of claim 2, wherein calibrating the electromagnetic load comprises calibrating the electromagnetic load based on the plurality of velocities of the host device and their respective magnetic force factors at each such velocity.
4. The method of claim 2, wherein calibrating the electromagnetic load comprises filtering the driving signal, when actively driving the electromagnetic load, with a filter having a response based on the plurality of velocities of the host device and their respective magnetic force factors at each such velocity.
5. The method of claim 1, further comprising recording the relationship and storing the relationship in computer-readable media.
6. The method of claim 5, wherein calibrating comprises retrieving the relationship from the computer-readable media and calibrating based on the relationship as retrieved from the computer-readable media.
7. The method of claim 1, wherein the mechanical motion is caused by normal use of the host device during its use by an end user of the host device.
8. The method of claim 1, wherein the mechanical motion is caused by a mechanical exciter during post-production calibration of the host device.
9. The method of claim 1, wherein the electromagnetic load comprises a haptic transducer.
11. The system of claim 10, wherein correlating the relationship comprises calculating based on the back-electromotive and the velocity, for each of a plurality of velocities of the host device, a respective magnetic force factor at such velocity.
12. The system of claim 11, wherein calibrating the electromagnetic load comprises calibrating the electromagnetic load based on the plurality of velocities of the host device and their respective magnetic force factors at each such velocity.
13. The system of claim 11, wherein calibrating the electromagnetic load comprises filtering the driving signal, when actively driving the electromagnetic load, with a filter having a response based on the plurality of velocities of the host device and their respective magnetic force factors at each such velocity.
14. The system of claim 10, wherein the processing subsystem is further configured to record the relationship and store the relationship in computer-readable media.
15. The system of claim 14, wherein calibrating comprises retrieving the relationship from the computer-readable media and calibrating based on the relationship as retrieved from the computer-readable media.
16. The system of claim 10, wherein the mechanical motion is caused by normal use of the host device during its use by an end user of the host device.
17. The system of claim 10, wherein the mechanical motion is caused by a mechanical exciter during post-production calibration of the host device.
18. The system of claim 10, wherein the electromagnetic load comprises a haptic transducer.
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April 16, 2020
May 30, 2023
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